Radon monitor



FIG. 1 is a top and front perspective view of a radon monitor showing my new design;

FIG. 2 is a top plan view;

FIG. 3 is a front elevational view, the rear elevational view being a mirror image;

FIG. 4 is a left side elevational view, the right side elevational view being identical; and

FIG. 5 is a bottom plan view thereof.

The back side is identical in appearance to the front side and the left side is identical in appearance to the right side. 

The ornamental design for a radon monitor, as shown and described. 